Keysets per seed and postgres

[callebtc]

Updates from LNbits mint port

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (bc2b555) 68.91% compared to head (6a4e4b5) 69.30%.

Files	Patch %	Lines
cashu/core/base.py	77.77%	6 Missing ⚠️
cashu/mint/router.py	0.00%	4 Missing ⚠️
cashu/mint/router_deprecated.py	0.00%	4 Missing ⚠️
cashu/core/db.py	80.00%	3 Missing ⚠️
cashu/mint/migrations.py	90.47%	2 Missing ⚠️
cashu/mint/startup.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   68.91%   69.30%   +0.38%     
==========================================
  Files          71       71              
  Lines        6164     6206      +42     
==========================================
+ Hits         4248     4301      +53     
+ Misses       1916     1905      -11     

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